Lr classic ver 6

Which version of LR6 do you have installed?

Here you can try to download LR 6.14 from the Internet Archive:

Win: https://web.archive.org/web/20231220005239mp_/https://prdl-download.adobe.com/Lightroom/60BA1251F1BC...

it's the latest available version of the perpetual license. Install it over your existing installation.

Please notice: it will take a while until the site is responding.

You can also try to reset the preferences to the default settings:

Resetting the lightroom preferences file - updated | Lightroom Queen Forums

Be aware: There's no more support for Lightroom 6:  End of Support | Lightroom 6 Downloads and Syncing (adobe.com)

You can't also activate/deactivate Lightroom because the appropriate server are no longer online.

Are you trying to install Lr 6 from the original disk? Or is Lr 6 already installed?

Trying to open what? Lr 6, or an installer program, or the disk?

Exactly what crashes ... your computer, or Lr 6, or the disk, or something else?